PDF malware analysis — malicious · 57606ac96560fd22

MALICIOUS

PDF

11.8 KB

MD5: b45fd90278104dd9435e9555e0eacc81 SHA-1: f4e4d4979b2d7dcf172a61c7cffa2d237090e015 SHA-256: 57606ac96560fd22764f1bbab16c51b6fb44ea9dd0205d3d29fed918c23e0ef4

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and designed to be executed as a stager. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of a known PDF vulnerability to achieve code execution. The ClamAV detection 'Pdf.Exploit.Agent-36063' further confirms the malicious nature of the file. The primary attack vector appears to be leveraging a PDF exploit to download and run a secondary payload.

Heuristics 7

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `e4601284c0b83c8a26089d314fedff99ba412700cf8c9a54bcd4b525d8637161`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5019 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `3a3971639da02317ba93e1d22475417b101b2483ede5cf9c20d4d8dab170d971`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11976 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `b1cf52167dc3f8d9251ab5919c2947157067da69f1d39c54cf341500ee962f59`	deobfuscated-js	PDF JavaScript deobfuscation pass	78931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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